Bolt-on parts to increase power

I have a 97 silverado, looking to get a little more power and efficiency out of the 350. I already have custom dual exhaust, K&N cold air intake, and a so far unnoticed power programmer. Any suggestions or pointers would be nice. The truck is lifted and I get around 12 MPG, although I know I shouldn't look for mpgs and lift in the same thing, help would be nice! Thanks

There are no "bolt-on" modifications that will give you any REAL gain. You can easily spend thousands of dollars on "snake oil" magical power parts and get marginal results at best. Save your money and buy a supercharger.

What size tires are you running? Have you considered re-gearing? That will be the best bang for your buck.

Anything to make it breath better such as intake, headers, exhaust will increase horse power. Be aware that any major mods will require you to reprogram the ECM to get the full benefit. I have a cold air intake, American racing headers, Corsa sport exhaust, diablo trinity tuner and a custom tune by diablew tune. I'll tell you what there is a night and day difference over stock... Keep in mind that all this comes at a price.

Anything to make it breath better such as intake, headers, exhaust will increase horse power. Be aware that any major mods will require you to reprogram the ECM to get the full benefit. I have a cold air intake, American racing headers, Corsa sport exhaust, diablo trinity tuner and a custom tune by diablew tune. I'll tell you what there is a night and day difference over stock... Keep in mind that all this comes at a price.

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Sorry one of those days... I see you have already done what I had just suggested. One more thing you can try is upgrading your fuel injectors... I know there is a performance replacement for the 97... We are looking at doing it on my sons... Other than that it would be changing the gears.

Like they stated above if you haven't regeared, no bolt on part will give you the gains you seek. Most trucks like yours came with either 3.42s or 3.73s, neither are low enough for 35s. Large tires and to high of gears not only kill performance and mileage, but will also strain the motor and tranny causing premature failure. You should look into at least running 4.10s or preferably 4.56s.

True you need to regear it 4.56 sounds best that's what my friend did and it helped or got it back to stock. When my buddy put small tires did his Burb have some get up so really he was just wanting it to get back to stock but the 35" tires are heavy as well.

What about a 'Throttle Body Spacer' They claim a small bump in HP but even with a anemic 30 LBS in torque, I would think it was worth the $100.00 for a quality throttle body spacer ? I'm planning installing one on my 1990 305 TBI Silverado.

I should mention that I have done a full tune-up Plugs, wires and the so on. I put a K&N cold air intake doing away with the stock air cleaner, And I installed a rebuild and matched set of Thorttle body injectors and they do make the truck feel a little more peppy.

But I was wondering about this TBS as it doesn't claim to give you huge power increase, it does say you might get about 10HP and 30 pounds of tourqe and a slightly better MPG. It says it only turns the intake volume and spins it so as to produce a better mixture

There are no "bolt-on" modifications that will give you any REAL gain. You can easily spend thousands of dollars on "snake oil" magical power parts and get marginal results at best. Save your money and buy a supercharger.

What size tires are you running? Have you considered re-gearing? That will be the best bang for your buck.

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I'll second this advice. I have owned cars/trucks for a lot of years, done lots of things to them. Take it from a veteran of the auto world, the only way you get real power increases is by doing internal engine modifications. The spacers, exhaust, intakes, that stuff is like putting lipstick on your truck. Any "gains" in power from these is minimal at best.